Safety paper



" v 1,588,201 B. W. SMITH SAFETY PAPER June 8 1926. 7

Filed May 14, 1924 YINVEIYTOR. .Buryess WJmft/z 11;, ATTORNEY Patented June 8, 1926. v

" UNITED-STATES, PATENT OFFICE. e

games-s w. surrn, or nocnns'rn'n, NEW YORK, Assreuon TO THE 'ronn comrm, me, or ROCHESTER, NnwYonK, A' conronarrom or new you.

SAFETY: ,PAPER.

Application filed-,May 14, 1924. Serial No. 713,222.

Thisinvention relates to safety paper for checks, drafts, certificates and other instruments, one object of the invention being to supply an effective safety .paper of pleasing appearance and relatively simple nature capable of being manufactured at a low .cost. A- further object is to afiord. apaperhaving the above advantages'and capable in additiom-of being made up in-relatively light tint or color, or"praetically white, and having the appearance'of'flaid paper or similar paper of relatively fine quality.

To these and other ends the invention resides in certain improvementsand combinations of parts, all as will be hereinafter more .fully described, the novel features being pointed out in the claims at the end of the specification. ,In the drawings: 1

Figure 1 is a view of a check made of safety paper embodying the present invention and showing the result of an attempted erasure. I v

Figure 2 is an enlarged sectional View of the same.

Figure .3 is an enlarged fragmentary view of a modification, and

Figure ''is a sectional view of the modification of Figure 3.

similarreference numerals throughout the several views indicate the same parts.

This invention comprises a safety paper of a simple nature inexpensive to manufac ture in which an effective protective feature or marking is applied in such a way as to at the same time simulate the appearance of laid.v or other high grade paper, so that the protective marking is thus not only disguised but also serv'es to enhance the appearance of the paper. This protective marking is accomplished by the use of sensitive ink, preferably of an initially light tint or color,which however reacts sharply with chemical eradicating means such as the bleaching agents well known in the art, to thereby produce a conspicuous change or deepening of color in striking contrast with the normal appearance of the paper adjacent the portion to which the eradicator is ap lied. Y elpresent invention may be. carried out in various. ways by applying the sensitive ink so as to simulate various natural characteristics of paper in common use.v Thus a comparatively fine grade of paper known as laid paper bearsthe line marks of the screen on which it is formed when hand madeby the actionof thedandy roll in processof manufacture on the usual paper machine, such lining resembling a water .mark in that the paper is somewhat reduced in thickness at-the portions bearing the lines. This natural paper appearance may be very closely simulated by printing similar lining on the paper with ink slightly darker in tint or color than the latter, as.

shown at 5, Figures 1 and 2, on a check form 6.

' It has'been found that such ink may be readily made with an ingredient rendering it "sensitive .to the action of chemical eradicators, such as commonly used, so that theapplicatidn of such eradicators for thepurpose of altering matter written on the paper, in

reaction with.the ink, quickly develops a dltferent or deeper color in the printed lining and the lines are .made ,to appear conspicuously as illustrated at the portion 7 of the paper surface to which" the eradicator has been applied. Such alteration of the appearance of the paper at once calls atten-- tion to the attempted alteration, particularly because of the resemblance of the lines to the conventional cancelling-lines commonly drawn through matter which it is Intended to strike out.

tention'to the latter for investigation of its validity.

of an indelible but sensiefiect is preferab may) be formed with the tive character and desired characteristics by incorporating a' number of ingredients, such, for example, as.

manganese ferrocyanide, tolidine hydrochlo- Such appearance of crossed out matter on the check thus calls atride, benzidine sulphate and other substan tially colorless substances adapted to. react with and develop a comparatively deep stain under the application of the common eradicating or bleaching chemicals. Such an in gredient maybe employed, in conjunction with anyother means for producing the desired initial tint, in an oil varnish or other vehicle as well understood in the art, the finished ink having, as already stated, a

slightly deeper color than that of the paper ""the water marks with which paper is sketch"paper may be effectively simulated 'by' the application of the sensiti ve inkin the form of stippling. I

When an attempt is made to alter matter written on instruments formed as above-described, by the application ofthe ordinary chemical eradicators, the reaction of the latter with the sensitive ink of the paper at once causes the-latter to develop a conspicuous stain contrastin 'with adjacent surface portions to thereby disclose the attempted alteration and warn against thevalidity of the 1nstrument. Thejpaper may be cheaply produced by a single rinting impression with a sensit1ve ink. I desired additional matter may be pr nted on the surface of the pa-.

per, such for example as an overall pattern the pattern 8 lightly 8, Figures 3 and 4, of suitable character adapted to be removed when it is attempted to make an erasure by abrasive treatment of the paper as illustrated at 9, Figure 3,

to thereby aflt'ord additional protectionv against alteration in that manner also. Paper having the chemically sensitive markmg 5 described and also a. marking suchas I rinted with a relatively non enetrating m is effectively protected against attemptsto erase either b chemical means or by abrasion, and is at t e same 3 t me given the pleasing appearance of paper of fine texture I claim asmy invention:

p 1. ;A safety paper having marked thereon with sensitive ink a pattern arranged ,to initially simulate thenatural appearance of a .paper'and adapted to be conspicuously deepened in color by reaction with chemical ink eradicators to serve as a warning of at tempted erasure. p v

2. A safet p'aper'havin'g printed thereon a pattern a apted to simulate the natural appearance of a paper, in ink initially of a substantially colorless character adapted to react with and to be rendered conspicuously visible by chemical eradicating means applied tothe paper for making an erasure.

3. A safety paper printed with a pattern adapted to slmulate natural surface inequal-' ities of a paper characteristic of a process of manufacture, said pattern being printed in sensitive ink adapted to react with and to be conspicuously deepened ,in color by chemical ink eradicators appli thereby serve as a warning of alteration.

- 4:. A safety pa er having a pattern printed t ereon to sim ate the appearance of laid paper, said pattern be-' ing printed in sensitive ink adapted to react with and to be conspicuously deepened in color by chemical ink eradicating means, and

to thereby serve as a warning of alteration.

5. As an article of manufacture, a check made of safety paper rinted with a attern simulating the natura appearance 0 a pato the paper and to M arallel-line 7 per produced in process of manufacture,

said pattern being rinted in -sensiti ve ink adapted to react wit and to be consplcuous- 1y deepened in color by ink eradicating chemicals and to thereby afford warning of alteration. 6. As an article of manufacture, a-check made of safety paper having a parallel-line pattern thereon to simulate the appearance of laid paper-and 1n sensitive ink of an adapted to becons icuously deepened in color by the action 0 chemical ink eradlcators to thereby serve as a warning of alteration.

7. A safety paper having marked thereon initially substantially colorless character with sensitive ink a pattern arranged to ini- 9 tially simulate the natural ap earance of a paper and ada ted to be conspicuously deepcried in color y reaction with chemical ink el adicators, and having marked thereon also an additional pattern adapted to be removed 9 byabrasive treatment of the paper to afford warning of attempted erasure of matter l written on the aper. 8. As an article'ofi' manufacture, a check simulatinga natural a pearance of a paper produced in process 0 manufactureand in sensitive ink of an initially substantially colorless character adapted to be conspicuwith a visible pattern adapted to be removed by abrasive treatment of the paper, to aflord warning. of attem lted erasure written on the chec I I L Q BURGESS SMITH.-

1 made of safety paper printed with a pattern .ously deepened in color by reaction with chemical Ink eradicators, and prmted also of matter 

